It's shaping up to be a monster year for concerts, maybe the biggest ever - the latest on Radiohead, Coldplay and Bruce Springsteen

The ancient Mayans supposedly predicted that the world was going to end in 2012. That might explain why so many giant touring acts seem to be hitting the road next year. (They want to make their money while they still can.) Some acts like U2 and AC/DC may be taking the year off, but many of the other biggest names in the business seem to be gearing up for tours – even if they publicly refuse to admit it at this point. Here's a guide to the biggest (likely) tours of 2012.